SC6 didn't, it didn't have Seung Mina in it as well as Azwel iirc and @CyberEvil idk tbh, I think the demo will be based off the builds we've seen since why would TN make a network online beta where you can only play online when they know a good chunk of the fanbase is casual players? That would be a big blunder if they did that since they did that with SC6 where you could only play online and not even trainBBTAG and SC6’s network tests had their full default rosters, so anything’s possible at this point.
I think the smart thing to do would be to just use a limited time demo of the latest build and have online, arcade, training, and maybe tutorial be open modes but just lock out story mode and whatever else modes they don't wish to share at this time